At least one tip: we used the IRIX 6.5 development environment, and a 7.3.1 compiler.

Oh!
And compile your own iostream library (libcio), including the different set of STL template files.
The latter I've asked an ex-NaN engineer to make available or document again... the libcio that came with our compiler was not compatible with the rest of world. (Talking about a year ago now, maybe that is fixed. At that time it was a reported bug at SGI)

frank wrote:
On Irix we used gmake to compile Blender. gmake is the Gnu version of make.

Frank.

Frank, i figured that mush, so i used gmake immediately. however,
the problem was that 'cc' was being given 'gcc' compiler arguments (unrecognized). when traced back the tools/guessconfig script failed to 'guess' the machine. i'll try again with latest code.

overnight blender compiled successfully on IRIX! it even ran. there are a few python issues due to having 3 different versions of python in stalled on the system at the same time, and switching between them in the middle. but that should be straightened out on the retry.